JP2016094775A - Shutter winding shaft structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winding shaft structure which can reduce a generation sound at the contact of members for constituting a winding shaft, and is used in a shutter to which fireproof performance is required.SOLUTION: A winding shaft structure of a shutter comprises: an internal shaft 30; a winding cylinder which is located outside the internal shaft 30, and arranged so as to be rotatable with respect to the internal shaft 30; a metal-made coil spring 7 which is arranged between an internal peripheral face of the winding cylinder and an external peripheral face of the internal shaft 30, fixed to the winding cylinder at one end, and fixed to the internal shaft at the other end; and an aluminum pipe 8 which is arranged between the external peripheral face of the internal shaft 30 and an internal peripheral face of the metal-made coil spring 7. Grease is applied on an external peripheral face of the aluminum pipe 8.SELECTED DRAWING: Figure 4

Description

The present invention relates to a shutter winding shaft structure.

2. Description of the Related Art A shutter device in which a coil spring for weight balance is built in a winding shaft is known. The winding shaft includes an internal shaft and a winding cylinder that is rotatable with respect to the internal shaft. One end of the coil spring is connected to the winding cylinder, and the other end is connected to the internal shaft. When the shutter curtain descends due to the weight of the shutter curtain, the coil spring is twisted and the force is stored, and when the shutter is opened, the shutter curtain can be raised with a light operating force using the stored force of the coil spring. Yes.

With this, the coil spring is twisted with the forward / reverse rotation of the winding shaft during the opening / closing operation of the shutter, so that the coil diameter and pitch change, and the shape of the coil spring changes around the internal shaft. For this reason, the internal shaft and the coil spring come into contact with each other and unpleasant noise is generated.

In Patent Document 1, a shaft that is horizontally fixed between left and right brackets, a wheel that is rotatably supported on the left and right portions of the shaft, and a wheel that scrapes and returns the slat curtain, and one end portion wound around the shaft. A coil spring that is fixed to the shaft and has the other end fixed to the wheel and balanced with the weight of the slat curtain, and an interlocking horizontal shaft that is placed outside the coil spring and is horizontally mounted between the left and right wheels. And provided with a buffer support for supporting the coil spring from the inside on the shaft, and the buffer support prevents a large deflection of the coil spring and prevents the occurrence of unpleasant metallic collision noise. An apparatus is disclosed, and the buffer support is made of rubber, soft rigid resin, or the like.

In order to suppress the collision sound at the time of contact between members as much as possible, as described in Patent Document 1, it is desirable to configure the buffer support from an elastic member such as rubber or soft rigid resin. However, there are cases where it is not appropriate to use elastic members such as rubber or soft rigid resin (for example, for fire prevention) depending on the installation location and application of the shutter device, and rubber or soft rigid resin due to cost and weight reduction requirements. In some cases, it is desirable to employ a member that is not an elastic member such as a non-elastic member such as metal or paper.
Utility model registration No. 2546134

SUMMARY OF THE INVENTION An object of the present invention is to provide a shutter winding shaft structure that can meet the above requirements.
One of the more specific objects of the present invention is a winding shaft structure that can reduce the noise generated when the members constituting the winding shaft are in contact with each other and that can be used for a shutter that requires fire prevention performance. Can be provided.

The technical means adopted by the present invention are:
An internal shaft,
A winding tube located outside the inner shaft and rotatably provided with respect to the inner shaft;
A metal coil spring provided between the inner peripheral surface of the winding cylinder and the outer peripheral surface of the inner shaft, one end fixed to the winding cylinder (in a later-described embodiment via a rotating wheel), and the other end fixed to the inner shaft When,
A buffer pipe provided between the outer peripheral surface of the inner shaft and the inner peripheral surface of the metal coil spring;
With
Grease is applied to the outer peripheral surface of the buffer pipe,
This is a shutter winding shaft structure.

In one embodiment, the buffer pipe is made of metal. In the embodiment described later, the buffer pipe is an aluminum pipe.
By adopting a metal buffer pipe, it is possible to provide a winding shaft structure that can be used for a shutter that requires fire prevention performance.
Further, a paper buffer pipe can be employed in a shutter winding shaft structure that does not require fire prevention performance.

In one aspect, a plurality of recesses are formed on the outer peripheral surface of the buffer pipe.
Although the shape and configuration of the recess are not limited, in one aspect, the plurality of recesses are a plurality of long grooves extending in the length direction with intervals in the circumferential direction. That is, on the outer peripheral surface of the buffer pipe, a plurality of groove portions (V grooves in the embodiments described later) are formed in the length direction at intervals in the circumferential direction.

  In the present invention, by providing a buffer pipe with grease applied to the outer peripheral surface between the internal shaft and the coil spring, the frictional resistance at the time of contact is reduced by the grease, and the impact at the time of contact is absorbed by the viscosity of the grease. Therefore, the generated sound can be reduced.

  Therefore, the buffer pipe can be formed from a hard member other than the elastic member, and by using the metal buffer pipe, it is possible to provide a winding shaft structure that can be used for a shutter that requires fire prevention performance.

In the case where a plurality of recesses are formed on the outer peripheral surface of the buffer pipe, the plurality of recesses form a grease pool of grease applied to the outer peripheral surface of the buffer pipe.
Furthermore, by reducing the weight of the buffer pipe (resulting in cost reduction) by the recess, and reducing the contact surface with the inner peripheral surface of the coil spring in addition to the presence of grease applied to the outer peripheral surface of the buffer pipe Further, it is possible to reduce frictional resistance at the time of contact between members and sound generated at the time of contact, and to provide quieter operation sound and comfortable operability.

It is the front view (opening part fully closed state) and side view of a window shutter apparatus. It is the front view and side view which show the inside of a shutter case. (A) is a general view of a winding shaft, and (B) is a diagram showing details of the winding shaft. It is a figure which shows the internal structure of a winding shaft. (A) is a general view of an aluminum pipe, and (B) is an enlarged sectional view.

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view and a side view of a window shutter. The window shutter includes left and right guide rails 1 erected on both left and right ends in the width direction of the window opening, and a shutter case provided above the window opening. 2, a winding shaft 3 (see FIG. 2) provided in the shutter case 1, and a shutter curtain 4 having an upper end coupled to the winding shaft 3. As the winding shaft 3 rotates forward and backward, the shutter curtain 4 is drawn out from the winding shaft 3 and descends to close the window opening, and the shutter curtain 4 is wound around the winding shaft 3 to open the window. Open the opening. The guide rail 1 is supported by a guide rail base frame 5 provided in a take-out shape on the wall surface of the window opening.

As shown in FIGS. 2 and 3A, the take-up shaft 3 is positioned above the guide rail base frame 5 and is supported between the left and right brackets 6 that are provided on the wall surface of the window opening. Yes. The winding shaft 3 includes a metal inner shaft 30 whose both ends in the length direction are fixed to the left and right brackets 6, and a metal winding cylinder 31 provided so as to be rotatable with respect to the inner shaft 30. ing. A space is formed between the outer peripheral surface of the inner shaft 30 and the inner peripheral surface of the winding cylinder 31.

As shown in FIG. 3 (B), rotating wheels 32 and 33 are rotatably provided on the outer peripheral surface of the inner shaft 30, and the inner peripheral surfaces at both ends in the length direction of the winding cylinder 31 are connected to the rotating wheel 32, By mounting on 33, the winding cylinder 31 can rotate with respect to the internal shaft 30 via the rotation holes 32, 33. The inner peripheral surface of the winding cylinder 31 is uneven in the circumferential direction, and the winding cylinder 31 and the wheels 32, 33 rotate integrally with the inner shaft 30 by fitting with the unevenness of the outer peripheral surface of the wheels 32, 33. It is supposed to be. In the intermediate portion in the longitudinal direction of the winding cylinder 31, the convex portion on the inner peripheral surface is in contact with the wheel 34 provided between the rotation holes 32 and 33, and the deflection (sagging) of the intermediate portion in the longitudinal direction of the winding cylinder 31 is made. Is preventing.

A coil spring 7 is provided on the outer side of the inner shaft 30 in the inner space of the winding cylinder 31. The coil spring 7 has a cylindrical shape, the inner diameter is larger than the outer diameter of the inner shaft 30, and the outer diameter is smaller than the inner diameter of the winding cylinder 31. As shown in FIGS. 3B and 4, one end of the coil spring 7 is fixed to the rotating wheel 33, and the other end is fixed to the internal shaft 30. The coil spring 7 is twisted around the outer peripheral surface of the internal shaft 30 as the winding cylinder 31 rotates.

When the shutter is closed, the shutter curtain 4 is lowered by rotating the winding cylinder 31 in the first direction with respect to the inner shaft 30, but when the winding cylinder 31 rotates in the first direction with respect to the inner shaft 30, The coil spring 7 is twisted in the first direction and the force is accumulated. When the shutter is opened, the coil spring 7 is twisted in the second direction by the stored energy, and the winding cylinder 31 rotates in the second direction with respect to the internal shaft 30, thereby raising the shutter curtain 4.

A space is formed between the outer peripheral surface of the inner shaft 30 and the inner peripheral surface of the coil spring 7, and is positioned between the outer peripheral surface of the inner shaft 30 and the inner peripheral surface of the coil spring 7. A cylindrical aluminum pipe (aluminum metal pipe) 8 is provided. The inner diameter of the aluminum pipe 8 is slightly larger than the outer diameter of the inner shaft 30. Even when the shutter curtain 4 is lowered and the coil spring 7 is twisted, there is a gap between the outer diameter of the aluminum pipe 8 and the inner diameter of the coil spring 7. As shown in FIG. 4, one end of the aluminum pipe 8 is close to the rotating wheel 33, and the other end of the aluminum pipe 8 extends to a portion near the fixed portion at the other end of the coil spring 7. By doing so, the inner peripheral surface of the coil spring 7 is not in direct contact with the internal shaft 30. In addition, the aluminum pipe 8 is excellent in fire resistance as compared with a buffer member made of an elastic member such as rubber or soft rigid resin, and thus can be employed in a winding shaft structure in a shutter that requires fire prevention performance. Of course, the aluminum pipe 8 may be used for a non-fire-proof shutter that does not require fire-proof performance.

Grease is applied to the outer peripheral surface of the aluminum pipe 8. By providing the aluminum pipe 8 with the grease coated on the outer peripheral surface between the inner shaft 30 and the coil spring 7, when the inner peripheral surface of the coil spring 7 and the outer peripheral surface of the aluminum pipe 8 come into contact with each other, The frictional resistance at the time of contact can be reduced, and the impact at the time of contact can be absorbed by the viscosity of the grease, so that the generated sound can be reduced. The grease has a dropping point of 200 ° C. or higher, preferably 250 ° C. or higher.

As shown in FIG. 5B, a plurality of V-grooves 80 are formed in the length direction on the outer peripheral surface of the aluminum pipe 8 at intervals in the circumferential direction. The V groove 80 forms a grease reservoir of grease applied to the outer peripheral surface of the aluminum pipe 8. Further, by forming a plurality of V grooves 80, the aluminum pipe 8 is reduced in weight (resulting in cost reduction), and in addition to the presence of grease on the outer peripheral surface of the aluminum pipe 8, the inner peripheral surface of the coil spring 7 is used. By reducing the contact surface, the contact resistance between members and the generated sound at the time of contact are reduced, and quiet operation sound and comfortable operability are provided.

In the illustrated embodiment, 16 V grooves 80 extending in the length direction at equal intervals in the circumferential direction are formed on the outer peripheral surface of the aluminum pipe 8, but the number of V grooves 80 is not limited, The intervals in the circumferential direction of the V grooves 80 may not be equal. Moreover, although the V-groove 80 having a V shape in cross section is illustrated, a groove portion having a cross-sectional shape other than the V shape (for example, a semicircular shape or a square shape) may be employed. Instead of the long groove, a plurality of concave portions (for example, a large number of short grooves and small semispherical concave portions are provided) may be formed over the outer peripheral surface of the aluminum pipe 8. In the illustrated embodiment, the V-groove 80 extends linearly in the length direction of the aluminum pipe 8, but the groove may be formed from a curved line.

In the above-described embodiment, the buffer pipe made of the aluminum pipe 8 has been described. However, in the shutter winding shaft that does not require fire prevention performance, the buffer pipe (not shown) made of a paper pipe having an outer peripheral surface coated with grease. May be used. Thus, when the inner peripheral surface of the coil spring 7 and the outer peripheral surface of the paper pipe are in contact with each other, the frictional resistance at the time of contact is reduced by the grease, and the shock at the time of contact is absorbed by the viscosity of the grease. The generated sound can be reduced. For the shape and mounting position of the paper pipe, the description and drawings of the aluminum pipe 8 can be used. In one embodiment, a groove such as a V-groove is not formed on the outer peripheral surface of the paper pipe, but a groove may be formed on the outer peripheral surface of the paper pipe.

Further, by providing a buffer pipe (aluminum pipe 8 or paper pipe) between the outer peripheral surface of the internal shaft 30 and the inner peripheral surface of the coil spring 7, the inner periphery of the coil spring 7 can be provided when no buffer pipe is provided. Since the gap between the inner peripheral surface of the coil spring 7 and the outer peripheral surface of the buffer pipe is narrower than the gap formed between the surface and the outer peripheral surface of the internal shaft 30, the coil spring 7 that accompanies the opening and closing of the shutter is reduced. And the contact between the outer peripheral surface of the coil spring 7 and the inner peripheral surface of the winding cylinder 31 is prevented as much as possible. When the buffer pipe is not provided, a relatively wide gap is formed between the coil spring 7 and the internal shaft 30, and the flutter of the coil spring 7 becomes large, so that the outer peripheral surface of the coil spring 7 and the inner periphery of the winding cylinder 31 are formed. In order to reduce the noise generated at the time of opening and closing the shutter, it is necessary to apply grease to both the outer peripheral surface of the inner shaft 30 and the inner peripheral surface of the winding cylinder 31. This increases the cost and the amount of work. On the other hand, in this embodiment, the sound generated at the time of contact at the time of opening and closing the shutter can be reduced by applying grease only to the outer peripheral surface of the buffer pipe.

3 Winding shaft 30 Internal shaft 31 Winding cylinder 7 Coil spring 8 Aluminum pipe

Claims (5)

An internal shaft,
A winding tube located outside the inner shaft and rotatably provided with respect to the inner shaft;
A metal coil spring provided between the inner peripheral surface of the winding cylinder and the outer peripheral surface of the inner shaft, one end fixed to the winding cylinder and the other end fixed to the inner shaft;
A buffer pipe provided between the outer peripheral surface of the inner shaft and the inner peripheral surface of the metal coil spring;
With
Grease is applied to the outer peripheral surface of the buffer pipe,
Shutter winding shaft structure.   The winding shaft structure according to claim 1, wherein the buffer pipe is made of metal.   The winding shaft structure according to claim 1, wherein the buffer pipe is made of paper.   The winding shaft structure according to any one of claims 1 to 3, wherein a plurality of recesses are formed on an outer peripheral surface of the buffer pipe.   The winding shaft structure according to claim 4, wherein the plurality of recesses are a plurality of long grooves extending in the length direction with intervals in the circumferential direction.

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